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Home >> Infiniti >> 2004 >> FX45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0102 & P0103 MAF Sensor >> Diagnostic Procedure
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Diagnostic Procedure

  1. Inspection Start 

    Which malfunction (P0102 or P0103) is duplicated?

    P0102 or P0103

    1. P0102: go to  2 .
    2. P0103: go to  3 .

  2. Check Intake System 

    Check the following for connection.

    • Air duct
    • Vacuum hoses
    • Intake air passage between air duct to intake manifold

    OK or NG

    1. OK: go to  3 .
    2. NG: Reconnect the parts.

  3. Check Ground Connections 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body. See Figure .

      Refer to GROUND INSPECTION  .

    OK or NG

    1. OK: go to  4 .
    2. NG: Repair or replace ground connections.

  4. Check Maf Sensor Power Supply Circuit 
    1. Disconnect mass air flow (MAF) sensor harness connector.
    2. Turn ignition switch ON.

      For mass air flow sensor & intake air temperature sensor location, see Figure .

    3. Check voltage between MAF sensor terminals 2, 4 and ground with CONSULT-II or tester.
      Fig 1: Checking Voltage At Mass Air Flow Sensor Terminals 2 & 4 (W/DVOM)
      G00344661Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Identifying Mass Air Flow Sensor Specifications
      G00344660Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: go to  6 .
    2. NG: go to  5 .

  5. Detect Malfunctioning Part 

    Check the following.

    • Harness connectors E211, M41
    • Harness connectors M82, F102
    • Harness for open or short between IPDM E/R and mass air flow sensor
    • Harness for open or short between mass air flow sensor and ECM
      1. Repair open circuit or short to ground or short to power in harness or connectors.

  6. Check MAF Sensor Ground Circuit For Open And Short 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 67. Refer to wiring diagram. See Figure .
      1. Continuity should exist  .
    4. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to  7 .
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

  7. Check MAF Sensor Input Signal Circuit For Open And Short 
    1. Check harness continuity between MAF sensor terminal 1 and ECM terminal 51. Refer to wiring diagram. See Figure .
      1. Continuity should exist  .
    2. Also check harness for short to ground and short to power.

    OK or NG

    1. OK: go to  8 .
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.

  8. Check Mass Air Flow Sensor 

    Refer to COMPONENT INSPECTION  .

    OK or NG

    1. OK: go to  9 .
    2. NG: Replace mass air flow sensor.

  9. Check Intermittent Incident 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. Inspection end 
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